Ground working device

Abstract

A ground working device is formed from a sub-frame having a first side and a second side, plural discs mounted for rotation on the sub-frame between the first side and the second side about an axis that extends from the first side to the second side; and a set of scoops mounted on each disc in ground contacting position. The scoops efficiently lift the ground surface material, which falls to the ground in a sorted manner with coarser material on top. A motor is operatively connected to the plural discs for rotating the discs about the axis. Each scoop in each set of scoops has a ground working face that extends transversely to the disc on which the respective scoop is mounted. The scoops each have concave ground contacting surfaces. Each scoop is received in a respective slot in the disc in which the respective scoop is mounted. The ground working device is mounted on a main frame, which is provided with ground engaging wheels. The sub-frame is retractably mounted on the main frame.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:  
     
       1. A road resurfacing device, comprising: 
       a frame having first and second sides and a front end and a back end;  
       ground engaging supports at least at each of the front and back ends for supporting the frame on the ground;  
       a ripper bar extending from the first side to the second side;  
       a separator extending from the first side to the second side and located nearer to the back end than the ripper bar for separating fine material from coarse material ripped up by the ripper bar;  
       the separator comprising plural scoops mounted for rotation under the frame and movable between a ground engaging position and a travel position, the scoops being mounted to dig into and lift ground material as the frame advances over a road surface;  
       each scoop having a concave lifting face that extends parallel to the axis about which the scoop rotates; and  
       means to attach the frame to a vehicle.  
     
     
       2. The road resurfacing device of  claim 1  in which the plural scoops are mounted for rotation opposed to the direction of movement of the frame over the ground. 
     
     
       3. The road resurfacing device of  claim 1  in which the ripper bar carries multiple replaceable teeth. 
     
     
       4. The road resurfacing device of  claim 1  in which the scoops are mounted on discs, the discs being mounted on a rod extending transversely across the frame. 
     
     
       5. The road resurfacing device of  claim 4  further comprising a motor operatively connected to the plural discs for rotating the discs about the axis defined by the rod. 
     
     
       6. The road resurfacing device of  claim 4  in which each scoop is received in a respective slot in the disc in which the respective scoop is mounted.